JP2003314469A - Refrigerant pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems in a conventional refrigerant pump wherein an intermediate shell is provided to ease distortion in welding, but the number of parts is increased and the tolerance of each part is accumulated to make centering of a drive shaft and a bearing difficult, and if integrated in the eccentric state, rotational torque becomes large to impede smooth rotation, and further drawing had to be performed, while securing dimensional accuracy because the whole periphery is formed of a thin-walled closed container, which results in difficult processing. <P>SOLUTION: A pump mechanism part is mounted inside a thick-walled closed container, and the thick-walled closed container is inserted in the thin-walled closed container and welded. If the dimensional accuracy of the thick-walled closed container is improved with this constitution, centering is facilitated. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant pump of a cooling device which efficiently cools a semiconductor element having a high heat generation by using a phase change of evaporation and condensation of the refrigerant.

[0002]

2. Description of the Related Art A conventional refrigerant pump (Japanese Patent Publication No. 7-4795)
7), as shown in FIG. 5 and FIG.
1 is provided with a thick intermediate shell 52 for supporting the pump mechanism portion 53.

Further, a hole 54 is provided in the rotor of the electric motor section as a refrigerant passage, and a suction port 6 provided in a suction plate 55.
1 was installed facing upwards. In addition, the suction pipe 56,
The discharge pipe 57 was also installed on the central axis of the refrigerant pump.

Further, the pump side bearing 58 and the cylinder 59 for accommodating the pump are separated from each other. Further, the suction plate 55 receives the drive shaft 50.

[0005]

In the conventional refrigerant pump as described above, the intermediate shell is provided to alleviate the distortion during welding, but the number of parts is increased and the tolerances of the respective parts are accumulated. Therefore, it is difficult to set the axes of the drive shaft and the bearing, and there is a problem in that if the shafts are installed in a state where the axes are deviated, the rotation torque increases and smooth rotation does not occur. Furthermore, since the entire circumference is composed of a thin-walled closed container, it has been difficult to perform the drawing process while maintaining the dimensional accuracy.

Further, since the rotor of the electric motor section is provided with a hole as a refrigerant passage, there is a problem that the refrigerant does not go into the hole of the rotor well and the amount of refrigerant circulation decreases when it is operated at a high speed. . Further, since the rotor is a DC electric motor in which a magnet is inserted, it is difficult to secure a space for the hole of the refrigerant passage when the rotor diameter becomes small. Also, since the final suction port of the suction port is installed at the upper end of the suction plate, it is easy to bite the refrigerant gas when gas enters the refrigerant pump, and when the gas of the refrigerant is bitten the refrigerant gas. Since the amount of circulation is reduced and the cooling capacity is sharply reduced, there is a possibility that the semiconductor element with high heat generation may be damaged. Further, since the suction pipe and the discharge pipe are also installed on the central shaft of the refrigerant pump, there is a possibility that the gas may be bitten into the operation.

In recent years, in rack type servers and the like, there is a strong demand for lowering the height of the refrigerant pump because of the height limitation.

Further, since the pump side bearing and the cylinder are separated from each other, it is necessary to assemble them while centering.
Furthermore, since the hole of the cylinder is eccentric, it was necessary to assemble it correctly.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to provide a structure of an airtight container which is easy to process and has high dimensional accuracy and a structure which is easy to assemble. Moreover, it aims at providing the structure which is hard to cause gas bite operation.

Another object of the present invention is to provide a structure for suppressing the height of the refrigerant pump.

[0011]

In order to solve this problem, the present invention has a structure in which a pump mechanism is mounted inside a thick-walled closed container, and the thick-walled closed container is placed inside a thin-walled closed container. Is inserted and welded. With this configuration, if the dimensional accuracy of the thick closed container is increased, the axis can be easily set.

Further, according to the present invention, a through hole is provided in the drive shaft to serve as a refrigerant passage. With this configuration, the refrigerant circulation amount can be ensured even when operated at high speed. Further, according to the present invention, the final suction port of the suction port installed on the suction plate is provided at the lower end of the pump mechanism section, the refrigerant suction port is provided at the upper end of the suction side end plate, and the refrigerant discharge port is provided at the lower end of the discharge side end plate. Is provided. As a result, gas entrapment operation can be prevented.

Further, according to the present invention, the upper end and the lower end of the stator of the electric motor unit are cut out, and the upper and lower ends of the thick-walled hermetic container that houses the pump mechanism are cut out. . This makes it possible to obtain a refrigerant pump having a lower height.

Further, according to the present invention, the pump side bearing and the cylinder accommodating the pump are integrated into a cylinder bearing, and the drive shaft is received by the cylinder bearing. As a result, it is possible to obtain a pump mechanism that is easy to assemble without performing centering work on the cylinder and the suction plate.

[0015]

The invention according to claim 1 is such that a stator of an electric motor unit is attached to the outside of a thin-walled hermetic container, a rotor of the electric motor unit is provided inside the hermetic container, and a rotational force of the rotor is provided. A drive shaft for transmitting to the pump mechanism section, and the pump mechanism section is mounted inside a thick-walled closed container, and the thick-walled closed container is inserted and welded inside the thin-walled closed container. Therefore, it is possible to accurately fix the pump mechanism section to the thick-walled closed container, and it is possible to assemble a refrigerant pump of stable quality with an aligned axial center.

According to a second aspect of the present invention, a suction port penetrating the suction plate of the pump mechanism section and a discharge port reaching the center of the drive shaft are provided, and the shape of the suction port is a crescent shape, and the final suction port is the pump mechanism section. A refrigerant passage is formed by providing a through hole at the center of the drive shaft by connecting the discharge port and the through hole of the drive shaft at the lower end, and the refrigerant discharged from the pump mechanism is driven smoothly. It passes through the shaft and is discharged outside the refrigerant pump. Further, even if gas enters the refrigerant pump, the liquid refrigerant collects at the lower end portion of the pump mechanism portion, so that the gas does not easily bite.

According to a third aspect of the present invention, a refrigerant suction port is provided at the upper end of the suction side end plate, and a refrigerant discharge port is provided at the lower end of the discharge side end plate. Gas enters the refrigerant pump. Even if it comes, since the liquid refrigerant is collected at the lower end of the pump mechanism, it has an effect of not easily biting the gas.

According to a fourth aspect of the present invention, the upper end and the lower end of the stator of the electric motor unit are cut out, and the upper end and the lower end of a thick-walled closed container that houses the pump mechanism unit are cut out. In this case, the height of the refrigerant pump can be reduced and it can be incorporated in the rack server.

According to a fifth aspect of the present invention, a pump-side bearing and a cylinder accommodating the pump are integrated into a cylinder bearing, and the drive shaft is received by the cylinder bearing. It eliminates the need for centering work and makes it easy to assemble, which has the effect of not mistakenly attaching the cylinder.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a sectional view showing an embodiment of the present invention. The stator 3 of the electric motor unit is attached to the outside of the thin-walled closed container 1, and the rotor 4 of the electric motor unit is arranged inside thereof. The rotational force of the rotor 4 is transmitted to the pump mechanism section 5 by the drive shaft 6. Further, the pump mechanism portion 5 is fixed to the thick closed container 2. A suction pipe 13 is provided at the upper end of the suction side end plate 11, and a discharge pipe 14 is installed at the lower end of the discharge side end plate 12. Reference numeral 7 denotes a cylinder bearing, which serves both as a bearing of the drive shaft 6 and a cylinder forming a pump chamber. Further, the thick closed container 2 is inserted into the thin closed container 1.

FIG. 2 is a sectional view taken along the line AA of FIG. 1 and shows the pump mechanism 5 in detail. This pump mechanism portion 5 engages with a cylinder bearing 7, an inner rotor 10 formed of a trochoidal curve, and the inner rotor 10, and the pump chamber 1
The outer rotor 9 constitutes the outer rotor 8.

FIG. 3 is a side view of the suction plate 8 of FIG. 1 viewed from the pump side. The suction plate 7 has a crescent-shaped suction port 16 penetrating therethrough so that the liquid refrigerant enters the pump chamber 18 shown in FIG. Further, the suction port 16 is installed so that the final position thereof is at the lower end of the suction plate. Reference numeral 15 denotes a discharge port, which is formed with a groove toward the center of the drive bearing and is installed so as to be connected to the hole 17 of the drive shaft in FIG.

FIG. 4 is a side view of FIG. 1, and the discharge side end plate 1
As shown in the side view of FIG. 2, the stator 3 of the electric motor unit has a shape in which the upper end and the lower end are cut out. Further, as shown in the side view seen from the suction side end plate 11, the thick closed container 2 has a shape in which an upper end portion and a lower end portion are cut out.

Next, the operation of the refrigerant pump having such a structure will be described. When the rotor 4 of the electric motor unit rotates, the drive shaft 6 press-fitted into the rotor 4 rotates. Since the drive shaft 6 is fitted in the hole of the inner rotor 10 as shown in FIG. 2, when the drive shaft 6 rotates, the inner rotor 10 also rotates in the direction of the arrow. At this time, since the outer rotor 9 meshes with the inner rotor 10, the outer rotor 9 also rotates in the direction of the arrow along with the inner rotor 10. As a result, the pump chamber 18 rotates in the direction of the arrow while changing its volume to exert a pumping action.

When a pumping action occurs in the pump mechanism section 5, the liquid refrigerant is sucked through the suction pipe 13 and enters the thick-walled closed container 2. The liquid refrigerant contained in the thick closed container 2 is then sucked into the pump chamber 18 through the suction port 16 of the suction plate 8. After the pressure of the liquid refrigerant is increased in the pump chamber 18,
It goes out of the thin closed container 1 through the discharge port 14 provided in the suction plate 8, the through-hole 17 formed in the drive shaft 6, and the discharge pipe 14.

In the refrigerant pump of this embodiment, since the pump mechanism portion 5 is directly attached to the inside of the thick-walled hermetic container 2, if the dimensional accuracy of the thick-walled hermetic container 2 is increased, the pump mechanism is increased. The perpendicularity of the portion 5 can be easily obtained and the axis center can be obtained. Further, since the thick closed container 2 is inserted into the thin closed container 2 to weld the thin closed container 1,
It is possible to obtain a method of fixing a thin-walled closed container that is less affected by distortion due to welding heat.

Further, in this embodiment, since the drive shaft 6 is provided with the through hole 17, the refrigerant circulation amount can be secured even when the rotor 4 is operated at a high speed.

Further, since the final suction port of the suction port 16 provided in the suction plate 8 is installed at the lower end of the pump mechanism section 5, even if gas enters the refrigerant pump, the liquid refrigerant remains in the pump mechanism section 5. It collects at the lower end of the and does not easily bite gas.

Further, since the suction pipe 13 is installed at the upper end of the end plate 11, even if the mixed refrigerant of gas and liquid enters the thick closed container 2, only the liquid refrigerant flows to the lower end of the pump mechanism section 5. It is structured like this.

Further, since the discharge pipe 14 is installed at the lower end of the end plate, even if gas enters the refrigerant pump, the liquid refrigerant accumulates in the lower end of the thin closed container 1 and easily bites the gas and does not flow out. It is configured.

Further, in this embodiment, the upper and lower ends of the stator 3 of the electric motor section are cut out, and the upper and lower ends of the pump mechanism section 5 are cut out, so that the height of the refrigerant pump is increased. It can be lowered and can be installed in a rack server or the like.

Further, in this embodiment, the pump side bearing and the cylinder accommodating the pump are integrated into the cylinder bearing 7, and the drive shaft 6 is received only by the cylinder bearing 7, so that the centering of the cylinder and the suction plate 8 is performed. Need not be performed, and a pump mechanism that is easy to assemble can be obtained.

[0033]

As is apparent from the above embodiments, the invention according to claim 1 is such that the stator of the electric motor unit is attached to the outside of the thin-walled hermetic container, and the rotor of the electric motor unit is provided inside the hermetic container. , A drive shaft for transmitting the rotational force of the rotor to the pump mechanism unit is provided, and the pump mechanism unit is attached inside a thick-walled closed container, and the thick-walled closed container is placed inside the thin-walled closed container. Since the container is inserted and welded, the pump mechanism section can be directly attached to the inside of the thick-walled closed container, and if the dimensional accuracy of the thick-walled closed container is increased, the perpendicularity of the pump mechanism section can be easily obtained and the axis center can be obtained. You can put it out. Also, since the thick closed container is inserted into the thin closed container and the thin closed container is welded, it is possible to obtain a method of fixing the thin closed container with less distortion due to heat of welding.

According to a second aspect of the present invention, a suction port penetrating the suction plate of the pump mechanism section and a discharge port reaching the center of the drive shaft are provided, and the shape of the suction port is a crescent shape, and the final suction port is the pump mechanism section. Since the coolant passage is formed by providing a through hole at the center of the drive shaft at the lower end and connecting the discharge port and the through hole of the drive shaft, it is possible to secure the coolant circulation amount even when the rotor is operating at high speed. Is possible. Further, even if gas enters the refrigerant pump, the liquid refrigerant collects in the lower end portion of the pump mechanism portion, and the gas is not easily bitten from the suction port.

According to the third aspect of the present invention, since the refrigerant suction port is provided at the upper end of the suction side end plate and the refrigerant discharge port is provided at the lower end of the discharge side end plate, the mixed refrigerant of gas and liquid is thick. Even if the liquid refrigerant enters the airtight container, the effect that only the liquid refrigerant flows to the lower end of the pump mechanism is obtained. Further, since the discharge pipe is installed at the lower end of the end plate, even if gas enters the refrigerant pump, the liquid refrigerant is easily accumulated in the lower end portion of the thin-walled closed container and easily intrudes the gas so that it does not flow out. .

According to a fourth aspect of the present invention, the upper and lower ends of the stator of the electric motor unit are cut out, and the upper and lower ends of the thick-walled hermetic container that houses the pump mechanism unit are cut out. Since it is possible to reduce the height of the refrigerant pump, the refrigerant pump can be installed in a rack server or the like.

According to a fifth aspect of the present invention, the pump-side bearing and the cylinder accommodating the pump are integrated into a cylinder bearing, and the drive shaft is received by the cylinder bearing. There is an effect that a pump mechanism portion that is easy to assemble can be obtained without the need of performing soaking.

[Brief description of drawings]

FIG. 1 is a sectional view of a refrigerant pump showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1 showing an embodiment of the present invention.

FIG. 3 is a side view of the suction plate viewed from the pump side according to the embodiment of the present invention.

FIG. 4 is a side view of FIG. 1 showing another embodiment of the present invention.

FIG. 5 is a sectional view of a conventional refrigerant pump.

6 is a cross-sectional view taken along the line AA of FIG. 5 of a conventional example.

[Explanation of symbols]

1 Thin-walled closed container 2 Thick closed container 3 Stator of electric motor section 4 Rotor of electric motor 5 Pump mechanism 6 drive shaft 7 cylinder bearing 8 Inhalation plate 9 Outer rotor 10 Inner rotor 11 Inhalation end plate 12 Discharge side end plate 13 Inhalation tube 14 Discharge pipe 15 outlets 16 suction port 17 through

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3H041 AA05 BB04 CC15 DD01 DD07                       DD09 DD12 DD13 DD38                 3H044 AA05 BB03 BB08 BB09 CC12                       CC14 DD01 DD06 DD08 DD12                       DD13 DD18 DD24 DD27 DD28

Claims (5)

[Claims] 1. A drive for transmitting a rotational force of the rotor to a pump mechanism unit by mounting a stator of an electric motor unit on an outer side of a thin airtight container and a rotor of an electric motor unit on an inner side of the thin airtight container. A refrigerant pump characterized in that a shaft is provided, the pump mechanism portion is attached to the inside of a thick closed container, and the thick closed container is inserted and welded inside the thin closed container. 2. A drive shaft having a suction port penetrating the suction plate of the pump mechanism section and a discharge port reaching the center of the drive shaft, the suction port having a crescent shape, and the final suction port provided at the lower end of the pump mechanism section. 2. The refrigerant pump according to claim 1, wherein a through hole is provided at the center of the refrigerant passage to connect the discharge port and the through hole of the drive shaft to form a refrigerant passage. 3. The refrigerant pump according to claim 1, wherein a refrigerant inlet is provided at an upper end of the suction side end plate, and a refrigerant outlet is provided at a lower end of the discharge side end plate. 4. The refrigerant according to claim 1, wherein the stator of the electric motor section is notched at the upper end and the lower end, and the thick closed container housing the pump mechanism is notched at the upper end and the lower end. pump. 5. The refrigerant pump according to claim 1, wherein the pump side bearing and the cylinder accommodating the pump are integrated into a cylinder bearing, and the drive shaft is received by the cylinder bearing.